CBSE Class 7 Answered
List the ways in wastewater present in sewage is generated and the kind of contaminants
present in each?
Asked by gspublicschool | 11 Mar, 2019, 08:46: AM
Expert Answer
Ways in which wastewater is generated in sewage:
- Blackwater: It originates from toilet fixtures, dishwashers, and food preparation sinks. It is highly contaminated with dissolved chemicals, particulate matter and is very pathogenic.
- Graywater: It originates from bathroom sinks, laundry machines, spas, and bathtubs. It contains urine.
- Yellow water: This is urine collected with specific channels and not contaminated with either blackwater or graywater.
|
Types of Impurities |
Examples |
|
Organic impurities |
Human faeces, animal wastes, oil, urea, pesticides, herbicides, fruit and vegetable wastes |
|
Inorganic impurities |
Nitrates, phosphates, metals |
|
Nutrients |
Phosphorus and nitrogen |
|
Bacteria |
Those which cause diseases such as cholera, dysentery, and typhoid |
Answered by Sheetal Kolte | 11 Mar, 2019, 11:02: AM
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